Use two angles on the same sample
Tactile surfaces are one direction in Heimtextil’s 27/28 presentation. For an embossed or brushed candidate, check shadows along the curve and see whether the motif remains visible from the front.
Make the visual specification repeatable
Keep the signed cutting, note the pattern and photograph it with a scale. For bulk approval, request a cutting from the actual lot and compare it at the same angle before accepting texture consistency.